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Lee. Ch. 17 Vocab.

Lee. Ch. 17 Vocabulary

the smallest particle of an element that can be identified with that element. Consists of protons and neutrons in the nucleus with surrounding electrons. atoms
A substance made of only 1 kind of atom. Examples are hydrogen, oxygen, carbon, and nitrogen. element
The perpetual randon movement of microscopic particles suspended in a fluid medium. Brownian Motion
The smallest particle of substance consisting of 2 or more atoms of the same or different elements bonded together. molecule
A chemical substance made of atoms of 2 or more different atoms combined in a fixed porprtion. compound
A discription that uses numbers and symbols of elements to describe the porportions of elements in a compound or reaction. chemical formula
The positively charged center of an atom, which contains protons and neutrons and has almost all of the mass of the entire atom but only a tiny fraction of the volume. nucleus
An electrically neutral particle that is 1 of the 2 kinds of particles found in the nucleus of an atom. neutrons
A positively charged particle in the nucleus of an atom along with neutrons. protons
A form of an element having a particular number of neutrons in the nuclei of its atoms. Diferent isotopes of a particular element have the same atomic number but different atomic mass numbers. isotopes
Number of protons in the nucleus of an atom atomic number
An atom (or group of atoms bound together)with a net electric charge, which is dure to the loss or gain of electrons.A model in which the electrons of an atom are pictured as grouped in concentric shells around the nucleus. Ion
A model in which the electrons of an atom are pictured as grouped in concentric shels around the nucleus. shell model of the atom
A chart that lists elements by atomic number and by electron arrangements, so that elements with similar chemical properties are in the same column periodic table
A fourth phase of matter, in addition to solid, liquid, and gas. In the plasma phase which exists only at high temperature, matter consists of positively charged ions and free electrons. plasma
Created by: leemac